/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraParameterDefinitionsPanelViewModel.h
Find a subscribed Parameter Definitions asset with a matching Id GUID, or otherwise return nullptr.
virtual const [UNiagaraParameterDefinitions](API\Plugins\NiagaraEditor\UNiagaraParameterDefinitions) * FindSubscribedParameterDefinitionsById ( const [FGuid](API\Runtime\Core\Misc\FGuid) & DefinitionsId ) const